Add support for Python 3.13

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-22.04]
-        python-version: [3.9, '3.10', '3.11', '3.12']
+        python-version: [3.9, '3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/conda-dev.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-22.04', 'macos-13']
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
     env:
       OS: ${{ matrix.os }}
       PYTHON: ${{ matrix.python-version }}

.github/workflows/main.yml

@@ -56,7 +56,7 @@ jobs:
           CIBW_TEST_SKIP: "*_arm64 *universal2:arm64 *linux_i686"
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
           CIBW_MANYLINUX_I686_IMAGE: manylinux2010
-          CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-*
+          CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-* cp313-*
           CIBW_SKIP: "*musllinux* *i686"
           CIBW_BEFORE_ALL_LINUX: >
             yum -y update && yum -y install epel-release && yum install -y re2-devel ninja-build

.github/workflows/release.yml

@@ -55,7 +55,7 @@ jobs:
           CIBW_TEST_SKIP: "*_arm64 *universal2:arm64 *linux_i686"
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
           CIBW_MANYLINUX_I686_IMAGE: manylinux2010
-          CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-*
+          CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-* cp313-*
           CIBW_SKIP: "*musllinux* *i686"
           CIBW_BEFORE_ALL_LINUX: >
             yum -y update && yum -y install epel-release && yum install -y re2-devel ninja-build

src/compile.pxi

@@ -42,14 +42,13 @@ def _compile(object pattern, int flags=0, int max_mem=8388608):
         return fallback(original_pattern, flags, "re.LOCALE not supported")
     pattern = unicode_to_bytes(pattern, &encoded, -1)
     newflags = flags
-    if not PY2:
-        if not encoded and flags & _U:  # re.UNICODE
-            pass  # can use UNICODE with bytes pattern, but assumes valid UTF-8
-            # raise ValueError("can't use UNICODE flag with a bytes pattern")
-        elif encoded and not (flags & ASCII):  # re.ASCII (not in Python 2)
-            newflags = flags | _U  # re.UNICODE
-        elif encoded and flags & ASCII:
-            newflags = flags & ~_U  # re.UNICODE
+    if not encoded and flags & _U:  # re.UNICODE
+        pass  # can use UNICODE with bytes pattern, but assumes valid UTF-8
+        # raise ValueError("can't use UNICODE flag with a bytes pattern")
+    elif encoded and not (flags & ASCII):  # re.ASCII (not in Python 2)
+        newflags = flags | _U  # re.UNICODE
+    elif encoded and flags & ASCII:
+        newflags = flags & ~_U  # re.UNICODE
     try:
         pattern = _prepare_pattern(pattern, newflags)
     except BackreferencesException:

src/includes.pxi

@@ -12,11 +12,6 @@ cdef extern from *:
     cdef void emit_endif "#endif //" ()
 
 
-cdef extern from "Python.h":
-    int PyObject_CheckReadBuffer(object)
-    int PyObject_AsReadBuffer(object, const void **, Py_ssize_t *)
-
-
 cdef extern from "re2/stringpiece.h" namespace "re2":
     cdef cppclass StringPiece:
         StringPiece()

src/match.pxi

@@ -115,12 +115,12 @@ cdef class Match:
         """Expand a template with groups."""
         cdef bytearray result = bytearray()
         if isinstance(template, unicode):
-            if not PY2 and not self.encoded:
+            if not self.encoded:
                 raise ValueError(
                         'cannot expand unicode template on bytes pattern')
             templ = template.encode('utf8')
         else:
-            if not PY2 and self.encoded:
+            if self.encoded:
                 raise ValueError(
                         'cannot expand bytes template on unicode pattern')
             templ = bytes(template)

src/pattern.pxi

@@ -417,7 +417,7 @@ cdef class Pattern:
         if not repl_encoded and not isinstance(repl, bytes):
             repl_b = bytes(repl)  # coerce buffer to bytes object
 
-        if count > 1 or (b'\\' if PY2 else <char>b'\\') in repl_b:
+        if count > 1 or <char>b'\\' in repl_b:
             # Limit on number of substitutions or replacement string contains
             # escape sequences; handle with Match.expand() implementation.
             # RE2 does support simple numeric group references \1, \2,

src/re2.pyx

@@ -151,7 +151,6 @@ VERSION_HEX = 0x000217
 
 cdef int _I = I, _M = M, _S = S, _U = U, _X = X, _L = L
 cdef int current_notification = FALLBACK_QUIETLY
-cdef bint PY2 = PY_MAJOR_VERSION == 2
 
 # Type of compiled re object from Python stdlib
 SREPattern = type(re.compile(''))
@@ -252,7 +251,7 @@ def escape(pattern):
     """Escape all non-alphanumeric characters in pattern."""
     cdef bint uni = isinstance(pattern, unicode)
     cdef list s
-    if PY2 or uni:
+    if uni:
         s = list(pattern)
     else:
         s = [bytes([c]) for c in pattern]
@@ -350,9 +349,9 @@ cdef inline unicode_to_bytes(object pystring, int * encoded,
         encoded[0] = 1 if origlen == len(pystring) else 2
     else:
         encoded[0] = 0
-    if not PY2 and checkotherencoding > 0 and not encoded[0]:
+    if checkotherencoding > 0 and not encoded[0]:
         raise TypeError("can't use a string pattern on a bytes-like object")
-    elif not PY2 and checkotherencoding == 0 and encoded[0]:
+    elif checkotherencoding == 0 and encoded[0]:
         raise TypeError("can't use a bytes pattern on a string-like object")
     return pystring
 
@@ -366,14 +365,7 @@ cdef inline int pystring_to_cstring(
     cdef int result = -1
     cstring[0] = NULL
     size[0] = 0
-    if PY2:
-        # Although the new-style buffer interface was backported to Python 2.6,
-        # some modules, notably mmap, only support the old buffer interface.
-        # Cf. http://bugs.python.org/issue9229
-        if PyObject_CheckReadBuffer(pystring) == 1:
-            result = PyObject_AsReadBuffer(
-                    pystring, <const void **>cstring, size)
-    elif PyObject_CheckBuffer(pystring) == 1:  # new-style Buffer interface
+    if PyObject_CheckBuffer(pystring) == 1:  # new-style Buffer interface
         result = PyObject_GetBuffer(pystring, buf, PyBUF_SIMPLE)
         if result == 0:
             cstring[0] = <char *>buf.buf
@@ -383,8 +375,7 @@ cdef inline int pystring_to_cstring(
 
 cdef inline void release_cstring(Py_buffer *buf):
     """Release buffer if necessary."""
-    if not PY2:
-        PyBuffer_Release(buf)
+    PyBuffer_Release(buf)
 
 
 cdef utf8indices(char * cstring, int size, int *pos, int *endpos):

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py3{7,8,9,10,11,12}
+envlist = py3{7,8,9,10,11,12,13}
 skip_missing_interpreters = true
 isolated_build = true
 skipsdist=True
@@ -12,6 +12,7 @@ python =
     3.10: py310
     3.11: py311
     3.12: py312
+    3.13: py313
 
 [gh-actions:env]
 PLATFORM =